"Emily Xavier."
And boy is there a lot of context under that. She has--somehow, she doesn't think about the mechanics--two fathers, only one of whom she can publicly admit. Her sister is not, legally, her sister. The fact that her name probably should be Xavier-Lehnsherr or Lehnsherr-Xavier or something but isn't.
She doesn't dwell on this, it just passes through her mind as an accepted piece of context.